I installed the M*Carbo trigger replacement this morning. I had no trouble until I noticed that the trigger pin spring was not over the dis-connector pin and that was after I installed the zip ties. I cut the zip ties and separated the stock halves again and installed the spring leg the way it should be then I installed the zip ties to hold everything together. I tried to line up the hammer pin and after about 15 minutes of fighting I noticed that the trigger pin was what was not lined up. As soon as the trigger pin fell into the hole and the two stock halves closed I was able to install the lower into the upper at the hinge. I then cut the zippies and installed the Recoil Pad and the new screw kit and accomplished a function check and all was right. Boy it sure makes that trigger feel better, still has some creap but nice and crisp. I would suggest everyone who has a SU16 do the trigger replacement. I even installed the AK47 trigger spring into the bipod and that makes a hell of a difference when you deploy the bipod.